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In a statement read to Brighton Youth Court, the mother said: "I saw what I can only describe as shadow come across my child's face.

"That shadow returns every time his name is mentioned. She was waking five times a night with night terrors.

"She still wakes crying and calling to me. She has suffered separation anxiety. She panics if I leave her for even a couple of minutes, if I just move into a different room.

"It has been devastating to witness her distress. She had to be prepared for a day in court and had to relive her trauma.

"This was harrowing. She cries for half an hour and won't let me cuddle or comfort her.

"At one stage she cried uncontrollably for 45 minutes. Sometimes she says 'How do I stop crying Mummy? Help me, help me,'.

"Unfortunately I know there will be more difficult times to come. Long term she will have to deal with the repercussions of her traumatic experiences for the rest of her life.

"I'm so scared for her future. Even once the court process is over this goes on for her.

"As a mother I find this totally terrifying."

The attacks happened in the spring last year with the girl telling her mother about them while she was in the bath.

After the girl demonstrated on a doll how she had been abused, her mother rang the NSPCC who contacted the police.

The boy originally denied the crimes but midway through his trial changed his plea on one count of rape and sexually assaulting the girl.

He was then found guilty of a second rape, forcing his victim to wait more than a year and a half for justice.

The girl's mother added that the court process and delays in the case had prolonged the youngster's suffering.

The devoted mother added: "I can't end this statement without saying what an amazing little girl she is."

District Judge Tereza Szagun said she found the mother's statement "heart wrenching" but thought the boy should face a stiffer penalty than the 24 months in custody maximum sentence the youth courts can issue.

The court was told there were "factors that were aggravating in a case that was already serious".

The judge said the boy needed to face up to his crimes before he could undergo any meaningful rehabilitation.

The boy was released on bail until he is sentenced at Lewes Crown Court next month.